Freedoom: Phase 1 is a Doom styled first person shooter game using the
Doom engine, featuring Four chapters, nine levels each, totalling 36
levels.
There is a massive back catalog, spanning over two decades, containing
thousands of Doom levels and other modifications (â€śmodsâ€ť) made by fans
of the original Doom game. Freedoom aims to be compatible with these and
allows most to be played without the original Doom datafiles.
Freedoom: Phase 1 aims for compatibility with The Ultimate Doom,
also known as plain Doom or Doom 1.